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A001787 as a simple table

n a(n)
0 0
1 1
2 4
3 12
4 32
5 80
6 192
7 448
8 1024
9 2304
10 5120
11 11264
12 24576
13 53248
14 114688
15 245760
16 524288
17 1114112
18 2359296
19 4980736
20 10485760
21 22020096
22 46137344
23 96468992
24 201326592
25 419430400
26 872415232
27 1811939328
28 3758096384
29 7784628224
30 16106127360
31 33285996544

[0,1,4,12,32,80,192,448,1024,2304,5120,11264,
 24576,53248,114688,245760,524288,1114112,2359296,
 4980736,10485760,22020096,46137344,96468992,
 201326592,419430400,872415232,1811939328,
 3758096384,7784628224,16106127360,33285996544]

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Last modified November 20 14:54 EST 2019. Contains 329337 sequences. (Running on oeis4.)